Trisul Network Analytics Blog

Tech tips and tricks from the world of network traffic and security monitoring

We’re kicking off the New Year 2019 with a couple of Trisul scripts to detect Covert Channels that use PING. This script was inspired by the blog post [How To: C2 over ICMP]

Many firewalls statefully allow outbound ICMPECHO (aka PING) requests and pass along the corresponding responses. Blocking PING altogether is rare because of its extensive use by IT teams for troubleshooting. Signature based detection such as those found in the default Snort icmp.rules are not be very effective in the absence of a particular pattern in each packet.

Network flows or conversations are a very important part of network security and traffic analytics. Trisul has always had excellent support for reconstructing, storage, and querying of very large scale flow databases. However, we watched customer workflows and found that we could dramatically make their lives easier by adding a couple of nifty new features. We just pushed out a new release that puts these two new tools in your hands.

Aggregate Flows

Run a query and aggregate all parameters that make up a flow

Export to Excel

On all flow related tools add a “Export to XLSX” button that exports results into a MS Excel document

Aggregate Flows

You used the “Explore Flows” tool in previous versions of Trisul to query flows using any combination of ips, ports, protocols, netflow interfaces, etc. This works great when your primary use case is security where you expected a few thousand hits. The Explore Flows tool used only the first MaxCount (by default 10K) flows to perform the analysis on the browser.

New Ubuntu 18.04 repository ready to install packages

We just released packages of Trisul Network Analytics for Ubuntu 18.04 LTS 64-bits (Bionic Beaver). For most new users of Trisul we recommend the Ubuntu 18.04 64-bits Server Install as the first choice installation platform.

We just released new builds of Trisul Network Analytics 6.5 with some exciting updates.

Trisul Network Analytics is a distributed monitoring platform. In the distributed setup, a network of “Probe nodes” can report to one or more “Hub nodes”. We provide Ubuntu/CentOS/RHEL packages for the probe and hub nodes. But we really like Docker for its sheer ease of deployment and upgrades. We already have a popular Docker Image with over 10K pulls for our single-node solution called trisulnsm/trisul6